One of the common stumbling blocks
during a typical EFI install on the Corvair is the fuel delivery side of things.
Obtaining a clean install and one without the noise and ground clearance
issues with an external pump[s] is the issue at hand. Our EFI kits are quite
complete as they contain all the necessary brackets, fittings, plugs, special adapters,
sensors, etc. But no matter how many suggestions or help was given to the
installer regarding the fuel delivery system, the end result was always one of less
than satisfactory.

The most common issue was the
noise and vibration from the external EFI pump. Other installs required both a high
volume, low pressure, feed pump and a high pressure EFI pump. These installs, as you
may surmise were also quite noisy. Secondary issues included ground clearance and
plumbing of the high pressure EFI system as well as problems associated with using an
older fuel tank which generally had an accumulation of rust, dirt and other foreign matter
in the tank. While these small debris may not cause major issues with a fuel system
designed for a carburetor, these same small particles will wreak havoc on an EFI system.

After investigating the above
issues, it was determined that the best way to approach this hurdle was to start from
scratch and supply a new tank with a custom made in tank EFI pump system specific for a
Corvair EFI install.

A
new tank is used and all sheet metal and tube parts used for the conversion are stainless
steel.The pump assembly sits in an semi-enclosed,
full length, cylindrical sump which mounts on the top of the tank and extends to
the bottom. A filter element with a generous surface area is attached to the pump,
assuring a clean supply of fuel to the pump and protecting the pump from damage.

A
standard GM EFI style lock ring retainer and O-Ring is used to affix the pump assembly to
the tank.The inlet and return ports are on
the top of the tank, but one could also use the stock feed line on the bottom of the tank
for the return, if desired.

A custom made top mount fuel level sending unit is also
available.This is a solid state type sender
which has no external float, hinge arm or wire wound wiper assembly. This design has
many advantages.The full length axial
configuration does not require a float to pivot at the end of the arm.There are no wiper contacts in the assembly to wear
out, bend or become corroded.The full
electronic assembly is housed in one compact, self contained, unit.Nothing hangs out from the unit, so nothing is
bouncing around in the tank during normal commuting, spirited driving or full competition
events.These custom fuel level sending units
are available in the 90 ohm configuration for late cars and 30 ohm for the early cars.We can also supply sending units in other
resistance ranges to accommodate custom fuel level gauges.

The in tank EFI pump assemblies are available as complete
conversions with new tanks or as a kit for customers who would like to weld the adapter
plate in their tank.

All modern EFI cars have the fuel pump enclosed in the gas
tank.This configuration has a number of
advantages:

Quiet operation.An in tank pump install affords a silent pump
operation as the pump is not mounted on a body or frame member on the Corvair.When mounting an external pump on the Corvair
unitized body the sound of the pump is transmitted into the car.Externally mounted EFI pumps most often have
unacceptable noise related operating issues.The
constant drumming noise of the pump can taint an otherwise nice install.

Cool running, better
longevity.The pump runs cooler when
mounted in tank as the volume of fuel acts as a cooling fluid and heat sink.External pumps do not have these advantages and
they are subject to the hazards of living outside and are more prone to damage and early
failure.

Better Performance.By placing the pump right in the tank the entire
length of fuel line to the engine is pressurized with fuel.There is no chance of vapor lock or starving of the engine due to pump
cavitation.These are notable issues with an
externally mounted pump which typically would require another 'pusher' pump to be used.Pusher or feed pumps, are mounted by the gas
tank and push fuel to the high pressure EFI pump which is mounted by the engine.
High pressure EFI pumps are not designed to pull fuel, but to push fuel at high pressure.

Lower Cost.Since only one pump is required, you save the costs
of the required 'pusher' pump, surge tank, connecting lines and fittings.

Higher Reliability.With one pump in the system vs. two pumps, you have
doubled your reliability.Another way to look
at this is with one pump you have reduced your possible failure points in half.

You can quickly see why all modern EFI cars have an in tank
pump.

The in tank EFI pump assemblies are
available as complete conversions with new tanks or as a kit for customers who would like
to weld the adapter plate on their tank.